Paper bag and closure therefor



Aug. 1, 1933.- J. A. ROSMAIT PAPER BAG AND CLOSURE THEREFOR 2Sheets-Sheet 1 Filed June 5, 1931 INVENTOR. c/olm ,4. fiosmazt ATTORNEYSAug. 1, 1933. J. A. ROSMAIT PAPER BAG AND CLOSURE THEREFOR Filed June 5,1931 2 Sheets-Sheet 2 INVENTOR. c/ohn x4 Posmazt' BY V 2% ATTORNEYS.

Patented Aug. 1, 1933 UNITED STATES PATENT OFFICE Filer Fibre CompaFiler City, Mich., 2. Corporation of Michigan Application June 5, 1931.Serial No. 542,322

Claims.

This invention relates to improvements for paper bags and closurestherefor.

An object is to provide a paper bag either of the single wall ormultiple wall type and either 5 of the valve type or open end type,which bag is so constructed and provided with a closure that efiectivelyseals the same against the loss of its contents. The particular type ofbag here shown is adapted to be employed as a container for m powderedmaterials and the closure here provided for the bag is adapted to retainits powdered contents against leakage or seepage from the bag.

An object of the invention is to provide in a bag of this type a closurewhich includes a line of stitching securing the side walls of the bagtogether and a closure strip secured in the manner here described overtheend of the bag and sealing the end and perforations caused bythestitching against the loss of the contents of the bag.

Certain meritorious features are embodied in the particular type ofclosure strip and its particular combination with the stitching and inthe arrangement of the adhesion 6f the strip to the walls of the bag andwith respect to the line of stitching.

An important feature of the invention is included in the provision ofreinforcement strips which cooperate with the closure strip and with thestitching to provide an effective closure for the end of the bag and toprevent tearing of the stitching through the side walls.

The closure or sealer strip is preferably adhesively secured to thereinforcement strip on one or both side walls of the bag, as the casemay be, adjacent to the margin of the reinforcement strip and also tothe side wall of the bag adjacent said margin of the reinforcement stripso that the line of adhesive overlies the margin of the reinforcementand secures the closure strip to the side wall of the bag below themargin of the reinforcement strip to prevent leakage of material frombetween the bag wall and the reinforcement strip.

Another object is to provide a closure strip sealing the end walls ofthe bag and the perforations caused by the stitching, which is soadhesively secured to the side walls of the bag and over the line ofstitching as to effectually seal the same against leakage whileproviding sufficient flexibility to prevent rupture or breakage due tothe adhesive. A modification illustrating one embodiment of this idea isshown wherein transverse lines of adhesive are extended over the end ofthe bag walls and secured to both side walls of the bag but wherein eachtransverse line of adhesive extends over the stitching on one side wallof the bag only. In this construction said transverse lines of adhesionare staggered and, while they effectively bulkhead or box 01f portionsof the bag which are sealed against leakage, no single transverse lineof adhesive extends over the stitching on both sides of the bag.

The reinforcement strip or strips, as the case may be, and the sealerstrip terminate at the edges of the side walls and the stitched seamextends in a thread end that projects beyond the end of the side wallsbut is fastened down adjacent to or between said side walls to preventunravelling of the same.

Other meritorious features and characteristics of the invention willappear from the following description, appended claims, and accompanyingdrawings, wherein:

Figs. 1, 2, and 3 illustrate one modification of my invention, Fig. 1being an elevation of a bag embodying my invention with the closurestrip partly broken away, Fig. 2 being a fragmentary elevation of theopposite side of the same bag, and Fig. 3 being a vertical fragmentarysection through an end of the bag illustrated in Figs. 1 and 2.

Fig. 4 is an elevation of the reinforcement strip.

Fig. 5 is a fragmentary elevation of a bag end embodying my invention,portions of the side wall being broken away to show the construction,and illustrating the disposition of the end of the thread.

Fig. 6 is an elevation of one end of the bag illustrating a modifiedform of my invention.

Fig. 7 is a vertical sectional view through the bag and shown in Fig. 6.

Fig. 8 is a fragmentary elevation of an end of the bag embodying asecond modified form of my invention.

Fig. 9 is a vertical sectional view through the bag end shown in Fig. 8.

Fig. 10 is an elevation of the adhesive side of the sealer strip.

Fig. 11 is an elevation of a modified form of sealer strip with respectto the application of the adhesive thereto.

My invention is adaptable for use with multiple wall bags of either thevalve or openend type and it is adaptable for use on the single wallbag. In the drawings, for the sake of clearness, I have shown multiplewall bags having only two plies of material though it is common practiceto provide five or six plies, and the invention is intended for use withsuch bags. In the drawings the bags illustrated are of the open endtype, however valve structures are conventional to the trade and theinvention is obviously adaptable for use with the bag of this character,as is shown in my copending application of even date herewith.

In the various figures of the drawings the bag is shown as having sidewalls sewed together at each end by a line of stitching 20. Thisstitched seam is plain on one side of the bag, as shown in Figs. 1 and5, and terminates in a chain stitch on the opposite side of the bag, asshown in Figs. 2 and 3. In the bag structure shown in the drawings andparticularly as shown in Figs. 1 and 5 the side walls are gusseted andthe stitching extends entirely across the bag to seal the ends.Obviously one end of the bag will be completely finished and the bagwill be filled, after which the other end will be similarly finished.

I provide a reinforcement strip, illustrated in Fig. 4 and specificallyindicated as 22, which extends across one side wall of the bagunderneath the stitching. In Figs. l5, inclusive, this reinforcementstrip is shown as extending across that side wall of the bag underneaththe plain stitching. In the construction shown in these figures of thedrawings which is my preferred form, I provide in addition a sealerstrip. This sealer strip is indicated as 24.

In Fig. 3 the sealer strip is shown as secured to that side wall of thebag opposite the side wall which carries the reinforcement strip by thesame line of stitching. The sealer strip is further secured to such sidewall of the bag by two spaced apart parallel longitudinally extendinglines of adhesive 26 arranged above and below the line of stitching butnot superimposing the stitching. The sealer strip is of a width whichwill permit it to be folded over the end of the bag and over thestitching and reinforcement strip on the opposite side wall of the bag,as is shown in Figs. 3 and 5 particularly. I

The sealer strip has portions which carry adhesive arranged in aparticular manner and this will appear from an inspection of Fig. 1 ofthe drawings. It will there be seen that that portion of the sealerstrip which is folded over the bag has a longitudinal line of adhesive28 arranged adjacent and parallel to its margin and narrow spaced apartlines of adhesive 30 extending transversely of the strip. It will beseen that when the strip is folded over the end of the bag and over thereinforcement strip 22 the line of adhesive 28 which will extend acrossthe bag below and adjacent to the line of stitching 20 and the narrowtransverse lines of adhesive 30 will close the line of stitching andextend over the end of the bag and down along both side walls.

The sealer strip is of a width whereby it will extend beyond the marginof the reinforcement strip and down along the side wall of the bag andthe line of adhesive 28 will seal the strip. Such line of adhesion alsoseals the margin of the reinforcement strip to the wall of the bag andprevents leakage of the contents at such point.

The reinforcement strip is preferably held to the bag merely by thestitching and is not adhesively fixed to the adjacent side wall. It mayhowever be adhesively secured at the ends with adhesive lines 23 asshown in Fig. 4. The transverse lines of adhesive cooperating with thelongitudinal lines of adhesive form boxed off portions which serve afterthe manner of a bulkhead to limit the spreading of any leakage whichmight occur at the perforations caused by the stitching.

Any leakage out of the perforations caused by the stitching is preventedby the bulkheading produced by the adhesive over the reinforcement stripand also below the margin of the reinforcement strip, and the lines 23of adhesive at the ends of the reinforcement strip will seal the same atsuch point.

In the construction shown in Figs. 1-5 the reinforcement strip 22 isdisposed on one side only of the bag, but in the construction shown inFigs. 8 and 9 reinforcement strips are arranged on both the side wallsof the bag. In these constructions of Figs. 8 and 9 the reinforcementstrips only are held down by the stitching except as held down by theadhesive which secures the sealer strip in the bag wall and isillustrated in Fig. 4, and the sealer strip is held over the end of thebag solely by adhesion. In these figures of the drawings the stitchingis indicated by the same numeral 20 and the reinforcement strips by thenumeral 22. The sealer strip is of the character shown in Fig. 10.

In this figure the sealer strip will be found to have a line of adhesiveextending along and adjacent to each of its linear edges and transversenarrow lines of adhesive extending from the adhesive line at one edge tothe adhesive line at the opposite edge and across both ends of thestrip. The bag walls are sewed together through the two reinforcementstrips 22 arranged on opposite sides of. the bag. The sealer strip isthen folded over the end of the bag as illustrated in Fig. 9 and adheredto both side walls and to the reinforcement strips on both sides of thebag. The transverse lines of adhesive on the sealer strip extend acrossthe open end of the bag walls between the reinforcement strips.

In Figs. 6 and '7 a slightly modified form is shown. In these figures areinforcement strip 22 is arranged on one side of the bag only, and thaton the plain stitching side. The stitching does not extend through thesealer strip but the sealer strip is of the character shown in Figs. 8and 9 and is folded over the end of the bag and adhesively secured inplace as described in Figs. 8 and 9.

In the several constructions illustrated the reinforcement strips andsealer strips terminate at the edges of the side walls of the bag andthe stitching extends therebeyond in loose ends of thread which arefolded back against one side wall and secured in place to preventunravelling. A suitable method of securing the end of the stitching isto fold it into the gusset formed between the two side walls asillustrated in Fig. 5 where the end 21 of the stitching is shown sodisposed. This end 21 is glued down to hold it in place. The stitchingmight be folded against one side wall underneath the sealer strip if sodesired.

It is of course understood that staples or other securing means may beemployed instead of the stitching here shown and wherever the termstitching is employed herein it is intended to also designate thesealternative forms of fastening.

In Fig. 11 a modified form of sealer strip is shown. In this form ofconstruction the sealer strip is provided with transverse lines ofadhesive which are staggered.

In the construction shown in Fig. 11 a modified form of the sealerstripis illustrated wherein the strip is provided on that portion whichfalls on either side of the bag with spaced apart parallel lines ofadhesive, which may be indicated as .32 and 34, adapted to engage theside wall of the bag or the reinforcement strip 22, as the case may be,above and below the line of the stitching.

The transverse lines of adhesive in this instance do not extend entirelyacross the width of the sealer strip as they do in certain other figuresof the drawings but are arranged in a staggered form so that eachtransverse line of adhesive extends from the lowermost linear line ofadhesive on one side wall of the bag to the uppermost linear line ofadhesive on the opposite side wall of the bag. In this arrangement nosingle transverse line of adhesive would extend across the stitching onboth side walls of the bag. Each transverse line of adhesive wouldextend across the stitching on one side of the bag and over the end ofthe bag to a linear line of adhesive on the opposite side wall whichwould serve to form bulkhead portions as heretofore described, but whichwould preserve the desired flexibility of the bag walls at the end bylimiting the extent of the transverse lines of adhesive.

What I claim:

1. A paper bag having side walls secured together at one end by a lineof stitching, a reinforcement strip overlying one side wall underneathsaid stitching, a sealer strip overlying the other wall underneath saidstitching and also secured thereto by a line of adhesive extendingparallel to and below said line of stitching, said sealer strip foldedover the end of the bag and down along the opposite side wall andadhesively secured thereto below said line of stitching, said sealerstrip farther secured to both side walls by spaced apart lines 'ofadhesive extending transversely of the strip over the end of the bagfrom the line of adhesive on one side wall below the stitching to theline of adhesive on the other side wall below the stitching.

2. A paper bag having side walls secured together at one end by a lineof stitching, a reinforcing strip extending across one side wall of thebag underneath the line of stitching and secured thereto by saidstitching, a sealer strip folded over the end of the bag and adhesivelysecured to both side walls of the bag by relatively narrow spaced apartlines of adhesive extending transversely of the strip over the end ofthe bag and over theline of stitching on both sides of the bag, saidstrip provided with'a line of adhesion to each side of the bag paralleland spaced from the line of stitching and forming with the narrowtransverse lines of adhesive boxed oil portions completely enclosedwherein the stitching is free of adhesive.

3. A paper bag having side walls secured together at one end by a lineof stitching, a reinforcement strip extending across each side wallunderneath said line of stitching and secured thereto by said stitching,a sealer strip folded over the end of the bag and adhesively secured toboth side walls thereof by a longitudinal line of adhesive extendingparallel to and below said line of stitching and further adhesivelysecured over the end of the bag and to both side walls over thestitching by spaced apart lines of adhesive extending transversely ofsaid strip from its longitudinal line of adhesion on one side wall tothe corresponding line of adhesion on the opposite side wall forming asuccession of completely enclosed boxed off compartments wherein thestitching is free from adhesive.

4. A paper bag having side walls secured together at one end by a lineof stitching, a sealer strip folded over the end of the bag andadhesively secured thereto by parallel spaced apart lines of adhesivearranged above and below the line of stitching on each side wall andbynarrow transverse lines of adhesive extending across the 'line ofstitching on each side wall between said spaced apart parallel lines ofadhesive.

5. A paper bag having side walls secured together at one end by a lineof stitching, a sealer strip folded over the end of the bag andadhesively secured thereto by parallel spaced apart lines of adhesivearranged above and below the line of stitching on each side wall and bynarrow transverse lines of adhesive extending across the line ofstitching on each side wall between said spaced apart parallel lines ofadhesive, and additional transverse lines of adhesive extending from theuppermost parallel line of adhesive on one side JOHN A. ROSMAIT.

